Drove in to North Creek park, then the next dead end street west of the park. The creek is about 15 feet across, depth unknown. It seems likely the hash itself is on dry ground.

Going in from the park would mean crossing two or three creeks, not yet scouted. Going from the dead end would be shorter, but the geohasher would have to cross the confluence of all creeks, then hike through the woods (see picture).

I'll probably scout the multi-creek approach after work (the geohash is 5km NW of here), but hold out little hope for achieving the hash point itself.